FIELD INVESTIGATION OF BEACH PROFILE CHANGES AND THE ANALYSIS USING EMPIRICAL EIGENFUNCTIONS

Hiroshi Hashimoto; Takaaki Uda

doi:10.9753/icce.v18.84

No. 18 (1982), Conference Proceedings

No. 18 (1982)

FIELD INVESTIGATION OF BEACH PROFILE CHANGES AND THE ANALYSIS USING EMPIRICAL EIGENFUNCTIONS

Conference Proceedings

https://doi.org/10.9753/icce.v18.84

Published 1982-01-29

Hiroshi Hashimoto⁺⁻
Takaaki Uda⁺⁻

Hiroshi Hashimoto

Coastal Engineering Division, Public Works Research Institute, Ministry of Construction

Takaaki Uda

Coastal Engineering Division, Public Works Research Institute, Ministry of Construction

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Keywords

beach profile
profile change
Eigenfunction
field investigation

How to Cite

Hashimoto, H., & Uda, T. (1982). FIELD INVESTIGATION OF BEACH PROFILE CHANGES AND THE ANALYSIS USING EMPIRICAL EIGENFUNCTIONS. Coastal Engineering Proceedings, 1(18), 84. https://doi.org/10.9753/icce.v18.84

Abstract

In order to investigate the response of beach profiles to incident waves, computations by the empirical eigenfunction analysis proposed by Winant et al. are performed. The analysis of the data obtained at Ajigaura Beach over three years from 1976 to 1979 indicates that beach profile changes due to longshore and onshore-offshore sediment transport are separable by the empirical eigenfunction method. The beach profile changes due to longshore sediment transport has a time lag of 12 weeks with respect to the change of wave direction at Ajigaura Beach. It was found theoretically that this time lag was due to the sand waves propagating in the longshore direction. Regarding as onshore-offshore sand transport, the second eigenfunction is associated with the beach changes due to onshore-offshore sand transport caused by the change of wave height.

https://doi.org/10.9753/icce.v18.84

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FIELD INVESTIGATION OF BEACH PROFILE CHANGES AND THE ANALYSIS USING EMPIRICAL EIGENFUNCTIONS

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